Presentation: TweetDynamic Languages in Production: Progress and Open Challenges

Recent years have seen new languages developed around explicit goals like performance or simplified programming models, but there's been little focus on the essential problem of debugging programs in production. We will discuss problems we've seen in deployed Node.js-based systems and demonstrate tools we have developed -- both postmortem and in situ -- that shine light into the darkness that is characteristic of modern JIT'd VMs in production.